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a) Discuss the main role of per-unit systems. (CO3:P01 - 3 marks) b) A single phase...
Q8. The following data are obtained when open circuit and short circuit tests are performed on...
Q8. The following data are obtained when open circuit and short circuit tests are performed on a single phase, 50 kVA, 2400/240 Volt 50 HZ distribution transformer. VOLTAGE(volts)CURRENT (amperes) POWER (watts) 213 Measurement in low voltage side with high voltage winding open Measurement on high voltage side with low voltage winding shorted 240 5.97 60 20.8 750 (a) Neglecting the series impedance, determine the exciting admittance referred to the high voltage side. (b) Neglecting the exciting admittance, determine the equivalent...
1) A single-phase 50-kVA, 2400/240 volt, 60 Hz distribution transformer is used as a step-down tr...
1) A single-phase 50-kVA, 2400/240 volt, 60 Hz distribution transformer is used as a step-down transformer at the load end of a 2400-volt feeder whose series impedance is (1.0+2.0) Ω. The equivalent series impedance of the transformer is (10+j25) Ω referred to the high voltage (primary) side. The transformer is delivering rated load at 0.8 power factor lagging and at rated secondary volitage. Neglect the transformer exciting curent. Using the transtormer raltings as base quantities work this problem in per...
A single-phase 50-kVA, 2400/240-volt, 60-Hz distribution transformer has a 1-ohm equivalent leakage reactance and a 5000-ohm...
A single-phase 50-kVA, 2400/240-volt, 60-Hz distribution transformer has a 1-ohm equivalent leakage reactance and a 5000-ohm magnetizing reactance referred to the high-voltage side. If rated voltage is applied to the high-voltage winding, calculate the open-circuit secondary voltage. Neglect 'R and G^V losses. Assume equal series leakage reactances for the primary and the referred secondary
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8...
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8 kVA resistive load (i.e., the load has a power factor of 1.0) at rated voltage of 120 V a) If you assume the transformer is ideal, what would be the magni- tude of the expected primary side (240 V side) current? b) Again, if you assume the transformer is ideal, what is the apparent impedance of the load viewed from the high-voltage side of...
3. Three single-phase, 10 kVA, 460/120 V, 60 Hz transformers are connected to form a three-phase...
3. Three single-phase, 10 kVA, 460/120 V, 60 Hz transformers are connected to form a three-phase 460/208 V transformer bank. The equivalent impedance of each transformer referred to HV side is 1.0 + j2.0 Ω. The transformer delivers 25 kW at 0.9 pf lagging at rated voltage. Answer the following questions: (a) Draw a schematic diagram showing the transformer connection. Draw three separate single-phase transformers and complete their primary and secondary connections. (b) Determine the magnitude of transformer primary and...
Question 2 A single-phase transformer has the following nameplate ratings: 100 kVA, 7200/240 V and 60...
Question 2 A single-phase transformer has the following nameplate ratings: 100 kVA, 7200/240 V and 60 Hz. The following results are obtained from open-circuit and short-circuit tests: Test Open-circuit Short-circuit Voltage 7200 V 250 V Current 0.65 A 13.89 A Real Power Input 425 W 1420 W a) Determine the parameters of this transformer, all referred to the primary side. b) The secondary of this transformer is connected to a load that draws 100% of the rated power at rated...
(a) Describe the tests carried out on a single-phase transformer to determine its equivalent circuit parameters...
(a) Describe the tests carried out on a single-phase transformer to determine its equivalent circuit parameters and explain how each parameter is determined based on the test results. (b) A 2200/220 V, 15 kVA, single phase transformer has the following equivalent circuit parameters: The HV winding resistance and leakage reactance are 0.2Ω and 0.3Ω respectively. The LV winding resistance and leakage reactance are 0.012Ω and 0.03 Ω respectively. The magnetic circuit resistance and reactance referred to the HV side are...
can you calculate this question and explain why? thanks 1. A 250-kVA, 11000/2200-V, 50-Hz, single-phase transformer...
can you calculate this question and explain why?
thanks
1. A 250-kVA, 11000/2200-V, 50-Hz, single-phase transformer has the following parameters: RI 1.3 , R2 0.05 , Rel 193 k2, X1 4.5 Q X2 0.16 2 I,- 80 kQ Xml (a) Draw the approximate equivalent circuit of the transformer showing all the circuit parameters referred to the low-voltage side. Use the approximate equivalent circuit to calculate the input voltage and voltage regulation of the transformer when it delivers full load at...
lI. A single-phase 100 KVA, 2000/200 V transformer has the following test results Open-circuit (OC) test (LV side): 200 V, 8,0 A, 600 W Short-Circuit (SC) test (HV side): 100 V,50 A, 2000 W a. De...
lI. A single-phase 100 KVA, 2000/200 V transformer has the following test results Open-circuit (OC) test (LV side): 200 V, 8,0 A, 600 W Short-Circuit (SC) test (HV side): 100 V,50 A, 2000 W a. Determine the approximate equivalent circuit referred to the HV side. b. Find the voltage regulation at full-rated current delivering rated voltage and PF of 0.8 lagging. c. Calculate efficiency of transformer d. Assume that, voltage at HV side is 2000 V. Calculate the voltage at...
QUESTION 1 125 MARKS] The data in the Table 1 were obtained when open and short...
QUESTION 1 125 MARKS] The data in the Table 1 were obtained when open and short circuit test were performed on a single phase 50 kVA, 2400/240 V, 60 Hz transformer. Table 1 Voltage Current Power (V) (A) (Watt) 240 4.85 173 52 20.83 650 Test A Test B (a) Determine tests A, B and the sides the tests were done. Calculate the non-ideal transformer parameters referred to the low voltage side. Draw the equivalent circuit by labeling the parameters...
Q8. The following data are obtained when open circuit and short circuit tests are performed on a single phase, 50 kVA, 2400/240 Volt 50 HZ distribution transformer. VOLTAGE(volts)CURRENT (amperes) POWER (watts) 213 Measurement in low voltage side with high voltage winding open Measurement on high voltage side with low voltage winding shorted 240 5.97 60 20.8 750 (a) Neglecting the series impedance, determine the exciting admittance referred to the high voltage side. (b) Neglecting the exciting admittance, determine the equivalent...
1) A single-phase 50-kVA, 2400/240 volt, 60 Hz distribution transformer is used as a step-down transformer at the load end of a 2400-volt feeder whose series impedance is (1.0+2.0) Ω. The equivalent series impedance of the transformer is (10+j25) Ω referred to the high voltage (primary) side. The transformer is delivering rated load at 0.8 power factor lagging and at rated secondary volitage. Neglect the transformer exciting curent. Using the transtormer raltings as base quantities work this problem in per...
A single-phase 50-kVA, 2400/240-volt, 60-Hz distribution transformer has a 1-ohm equivalent leakage reactance and a 5000-ohm magnetizing reactance referred to the high-voltage side. If rated voltage is applied to the high-voltage winding, calculate the open-circuit secondary voltage. Neglect 'R and G^V losses. Assume equal series leakage reactances for the primary and the referred secondary
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8 kVA resistive load (i.e., the load has a power factor of 1.0) at rated voltage of 120 V a) If you assume the transformer is ideal, what would be the magni- tude of the expected primary side (240 V side) current? b) Again, if you assume the transformer is ideal, what is the apparent impedance of the load viewed from the high-voltage side of...
Question 2 A single-phase transformer has the following nameplate ratings: 100 kVA, 7200/240 V and 60 Hz. The following results are obtained from open-circuit and short-circuit tests: Test Open-circuit Short-circuit Voltage 7200 V 250 V Current 0.65 A 13.89 A Real Power Input 425 W 1420 W a) Determine the parameters of this transformer, all referred to the primary side. b) The secondary of this transformer is connected to a load that draws 100% of the rated power at rated...
can you calculate this question and explain why?
thanks
1. A 250-kVA, 11000/2200-V, 50-Hz, single-phase transformer has the following parameters: RI 1.3 , R2 0.05 , Rel 193 k2, X1 4.5 Q X2 0.16 2 I,- 80 kQ Xml (a) Draw the approximate equivalent circuit of the transformer showing all the circuit parameters referred to the low-voltage side. Use the approximate equivalent circuit to calculate the input voltage and voltage regulation of the transformer when it delivers full load at...
lI. A single-phase 100 KVA, 2000/200 V transformer has the following test results Open-circuit (OC) test (LV side): 200 V, 8,0 A, 600 W Short-Circuit (SC) test (HV side): 100 V,50 A, 2000 W a. Determine the approximate equivalent circuit referred to the HV side. b. Find the voltage regulation at full-rated current delivering rated voltage and PF of 0.8 lagging. c. Calculate efficiency of transformer d. Assume that, voltage at HV side is 2000 V. Calculate the voltage at...
QUESTION 1 125 MARKS] The data in the Table 1 were obtained when open and short circuit test were performed on a single phase 50 kVA, 2400/240 V, 60 Hz transformer. Table 1 Voltage Current Power (V) (A) (Watt) 240 4.85 173 52 20.83 650 Test A Test B (a) Determine tests A, B and the sides the tests were done. Calculate the non-ideal transformer parameters referred to the low voltage side. Draw the equivalent circuit by labeling the parameters...
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